Harold Hallikainen wrote:
> Following up on yesterday... I not that the datasheet indicates an MCLR
> pulse has to be at least 2us and go below 0.2Vcc. It also says MCLR is
> filtered to avoid false resets. I tried tying MCLR directly to Vcc on the
> programming header on our board. It worked fine through yesterday, but
> reset about 25 times overnight. 

 > so I'm
> thinking it's a hardware problem... but what hardware?
> 
> Thanks for any ideas!
> 
> Harold
> 

What's your power supply setup for the units that reset overnight? If 
it's derived from AC mains power, try running it on battery.

Do you have hardware I/O connected to it? Noise could come in on those 
lines.

Is it tucked away in the shop next to the EMI generator that only comes 
on at night?

Is it up against the wall shared by the business next door who has their 
high power aircompressor come on at night?

Any other environmental issues you might know of that could be related 
to this?

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